package com.yinp.proapp.utils;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.LocationManager;

import java.util.Objects;

public class GPS_Presenter {
    private Context mContext;
    private Receiver receiver;
    private GPS_Interface mInterface;
    private String GPS_ACTION = "android.location.PROVIDERS_CHANGED";

    public interface GPS_Interface {
        void gpsSwitchState(boolean gpsOpen);
    }

    public GPS_Presenter(Context context, GPS_Interface mInterface) {
        this.mContext = context;
        this.mInterface = mInterface;

        observeWifiSwitch();
    }

    private void observeWifiSwitch() {
        IntentFilter filter = new IntentFilter();
        filter.addAction(GPS_ACTION);
        receiver = new Receiver();
        mContext.registerReceiver(receiver, filter);
    }

    /**
     * 释放资源
     */
    public void onDestroy() {
        if (receiver != null) {
            mContext.unregisterReceiver(receiver);
        }
        if (mContext != null) {
            mContext = null;
        }
    }

    class Receiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            if (Objects.requireNonNull(intent.getAction()).matches(GPS_ACTION)) {
                if (mInterface != null) {
                    mInterface.gpsSwitchState(gpsIsOpen(context));
                }
            }
        }
    }

    /**
     * 判断GPS是否开启，GPS或者AGPS开启一个就认为是开启的
     * @return true 表示开启
     */
    public boolean gpsIsOpen(final Context context) {
        LocationManager locationManager
                = (LocationManager) context.getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
        // 通过GPS卫星定位，定位级别可以精确到街（通过24颗卫星定位，在室外和空旷的地方定位准确、速度快）
        boolean gps = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        // 通过WLAN或移动网络(3G/2G)确定的位置（也称作AGPS，辅助GPS定位。主要用于在室内或遮盖物（建筑群或茂密的深林等）密集的地方定位）
        boolean network = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        return gps || network;
    }
}

